The unravelling of radiocarbon composition of organic carbon in river sediments to document past anthropogenic impacts on river systems

Copard, Yoann; Eyrolle, Frédérique; Grosbois, Cécile; Lepage, Hugo; Ducros, Loïc; Morereau, Amandine; Bodereau, Nathan; Cossonnet, C.; Desmet, Marc

doi:10.1016/j.scitotenv.2021.150890

Cited by 9 publications

(5 citation statements)

References 47 publications

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“…It is important to note that in the case of fluvial environments, the sedimentation rate is variable over time contrary to lakes and quiet environments. Consequently, the 210 Pb xs dating method is not available in this study as previously mentioned in Grosbois et al (2012), Eyrolle et al (2019), Morereau (2020) and Copard et al (2021). Hence, these identified chronological landmarks (1963, 1969, 1980 and 1986) allow obtaining a robust age model presenting two main periods with constant sedimentation rates, the 1963 -1986 period with 2.4 ± 0.2 cm/y and the 1986 -2016 period with 1.3 ± 0.2 cm/y with uncertainties estimated to ± 2 years.…”

Section: Methodsmentioning

confidence: 99%

“…Operations in both U mining sites and NPPs can lead to radionuclide releases increasing their concentration in the environment. Several studies were performed in order to retrace the historical evolution and the origin of various radionuclides transiting along the Loire River during the last century (Copard et al, 2021;Eyrolle et al, 2019). Nevertheless, the uranium and lead from nuclear activities which were transferred along the Loire River since the beginning of the nuclear age remain poorly documented.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Deciphering sources of U contamination using isotope ratio signatures in the Loire River sediments: Exploring the relevance of 233U/236U and stable Pb isotope ratios

et al. 2022

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Deciphering sources of U contamination using isotope ratio signatures in the Loire River sediments: Exploring the relevance of 233U/236U and stable Pb isotope ratios

et al. 2022

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“…In addition to lignin phenols, cutin acids are also important tracers of terrestrial OC since they are only present in nonwoody grasses and leaves (Goñi and Hedges, 1990). Given their distinct origin, ratios of the different phenols (SP/VP and CP/VP) can help elucidate the origin of plant sources (Bender, 1971;Farquhar et al, 1989), and petrogenic organic carbon (Copard et al, 2022;Hilton et al, 2010;Walinsky et al, 2009). Mayer (1994).…”

Section: Lignin Phenolsmentioning

confidence: 99%

“…Note that, in shallow environments (< 200 m), there is a wide variability of OC content and age, whereas in deeper settings, OC and radiocarbon content converge to lower content and older ages. (b) Scatter plot of the isotopic composition ( 13 C and 14 C) of OC in surface sediment stored in MOSAIC v.2.0 and the isotopic signatures of the main endmembers: marine biomass (Verwega et al, 2021), C3 and C4 plants(Bender, 1971;Farquhar et al, 1989), and petrogenic organic carbon(Copard et al, 2022;Hilton et al, 2010;Walinsky et al, 2009).…”

mentioning

confidence: 99%

The Modern Ocean Sediment Archive and Inventory of Carbon (MOSAIC): version 2.0

Paradis,

Nakajima,

Van der Voort

et al. 2023

Earth Syst. Sci. Data

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Abstract. Marine sediments play a crucial role in the global carbon cycle by acting as the ultimate sink of both terrestrial and marine organic carbon. To understand the spatiotemporal variability in the content, sources, and dynamics of organic carbon in marine sediments, a curated and harmonized database of organic carbon and associated parameters is needed, which has prompted the development of the Modern Ocean Sediment Archive and Inventory of Carbon (MOSAIC) database (http://mosaic.ethz.ch/, last access: 26 July 2023; https://doi.org/10.5281/zenodo.8322094, Paradis, 2023; https://doi.org/10.5168/mosaic019.1, Van der Voort et al., 2019). MOSAIC version 2.0 has expanded the spatiotemporal coverage of the original database by >400 % and now holds data from more than 21 000 individual sediment cores from different continental margins on a global scale. Additional variables have also been incorporated into MOSAIC v.2.0 that are crucial to interpret the quantity, origin, and age of organic carbon in marine sediments globally. Sedimentological parameters (e.g. grain size fractions and mineral surface area) help understand the effect of hydrodynamic sorting and mineral protection on the distribution of organic carbon, while molecular biomarker signatures (e.g. lignin phenols, fatty acids, and alkanes) can help constrain the specific origin of organic matter. MOSAIC v.2.0 also stores data on specific sediment and molecular fractions, which provide further insight into the processes that affect the degradation and ageing of organic carbon in marine sediments. Data included within MOSAIC are continuously expanding, and version control will allow users to benefit from updated versions while ensuring reproducibility of their findings.

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“…Radiocarbon measurements of OM in aquatic sediments are a powerful tool for identifying the input of aged soil OM transported to inland water and coastal ecosystems (Copard et al., 2022; Griffith et al., 2010; McCorkle et al., 2016; Vonk et al., 2010a). In particular, compound‐specific radiocarbon measurements of long‐chain fatty acids, or leaf waxes, have been widely used as an indicator of the mean age or transit time of plant‐derived carbon in sediments (Douglas et al., 2014; Galy & Eglinton, 2011; Vonk et al., 2019).…”

Section: Introductionmentioning

confidence: 99%

Distinct Modes of Aged Soil Carbon Export in a Large Tropical Lake Basin Identified Using Bulk and Compound‐Specific Radiocarbon Analyses of Fluvial and Lacustrine Sediment

Parker¹,

Ahad

Obrist‐Farner

et al. 2023

JGR Biogeosciences

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The 14C content of sedimentary organic matter and specific organic molecules provide valuable information on the source and age of organic matter stored in sediments, but these data are limited for tropical fluvial and lake sediments. We analyzed 14C in bulk organic matter, palmitic acid (C16), and long‐chain n‐alkanoic acids (C24, C26, C28), within fluvial and lake sediments in the catchment of Lake Izabal, a large tectonic lake basin in Guatemala. We combined these measurements with bulk and compound‐specific δ13C measurements, as well as sediment OC:N ratios, to understand the source and age of sedimentary organic matter in different regions of the lake catchment. Most fatty acid and bulk OM samples were characterized by pre‐modern carbon, indicating important input of aged carbon with residence times of hundreds to thousands of years into sediments. We identified two mechanisms leading to aged carbon export to sediments. In the high‐relief and deforested Polochic catchment, older OM and fatty acids are associated with low %TOC and low OC:N, indicating aged organic matter associated with eroded mineral soil. In the smaller, low‐relief, and largely forested Oscuro catchment, old OM and fatty acids are associated with high %TOC and high OC:N ratios, indicating export of undegraded aged plant biomass from swamp peat. The age of bulk OM and fatty acids in Lake Izabal sediments is similar to the ages observed in fluvial sediments, implying that fluvial input of aged soil carbon makes an important contribution to lake sediment carbon reservoirs in this large tropical lake.

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The unravelling of radiocarbon composition of organic carbon in river sediments to document past anthropogenic impacts on river systems

Cited by 9 publications

References 47 publications

Deciphering sources of U contamination using isotope ratio signatures in the Loire River sediments: Exploring the relevance of 233U/236U and stable Pb isotope ratios

Deciphering sources of U contamination using isotope ratio signatures in the Loire River sediments: Exploring the relevance of 233U/236U and stable Pb isotope ratios

The Modern Ocean Sediment Archive and Inventory of Carbon (MOSAIC): version 2.0

Distinct Modes of Aged Soil Carbon Export in a Large Tropical Lake Basin Identified Using Bulk and Compound‐Specific Radiocarbon Analyses of Fluvial and Lacustrine Sediment

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